x86/devicetree: Initialize device tree before using it

[ Upstream commit 628df9dc5ad886b0a9b33c75a7b09710eb859ca1 ]

Commit 08d53aa58cb1 added CRC32 calculation in early_init_dt_verify() and
checking in late initcall of_fdt_raw_init(), making early_init_dt_verify()
mandatory.

The required call to early_init_dt_verify() was not added to the
x86-specific implementation, causing failure to create the sysfs entry in
of_fdt_raw_init().

Fixes: 08d53aa58cb1 ("of/fdt: export fdt blob as /sys/firmware/fdt")
Signed-off-by: Ivan Gorinov <ivan.gorinov@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Rob Herring <robh+dt@kernel.org>
Link: https://lkml.kernel.org/r/c8c7e941efc63b5d25ebf9b6350b0f3df38f6098.1520450752.git.ivan.gorinov@intel.com
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/kernel/devicetree.c b/arch/x86/kernel/devicetree.c
index 76e07698e6d1524fe7c55ba73acbfe8e9911e68a..16e4681226503e85498bfe8babb3a65e193983bf 100644 (file)
--- a/arch/x86/kernel/devicetree.c
+++ b/arch/x86/kernel/devicetree.c
@@ -12,6 +12,7 @@
 #include <linux/of_address.h>
 #include <linux/of_platform.h>
 #include <linux/of_irq.h>
+#include <linux/libfdt.h>
 #include <linux/slab.h>
 #include <linux/pci.h>
 #include <linux/of_pci.h>
@@ -276,14 +277,15 @@ static void __init x86_flattree_get_config(void)
 
        map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK), (u64)128);
 
-       initial_boot_params = dt = early_memremap(initial_dtb, map_len);
-       size = of_get_flat_dt_size();
+       dt = early_memremap(initial_dtb, map_len);
+       size = fdt_totalsize(dt);
        if (map_len < size) {
                early_memunmap(dt, map_len);
-               initial_boot_params = dt = early_memremap(initial_dtb, size);
+               dt = early_memremap(initial_dtb, size);
                map_len = size;
        }
 
+       early_init_dt_verify(dt);
        unflatten_and_copy_device_tree();
        early_memunmap(dt, map_len);
 }